Process for treating paper



Feb. 27, 1934. L. M. YOERG PROCESS FOR TREATING PAPER Filed July 7, 1931 I N V EN TOR. 607? 1% BY Mafia 4 ATTORNEY.

Patented Feb. 27, 1934 UITED STATE rA'rN'r FFlC PROCESS FOR TREATING PAPER -Application July 7, 1931. Serial No. 549,151

6 Claims.

This application relates to improvements in processes for making paper and is directed more particularly to improvements in processes for making paper having hardened waterproofed 6 surfaces.

According to special features of this invention a novelprocess is provided wherein a continuous web of paper is manufactured from paper making material and the surfaces of the web are hardened or waterproofed immediately thereafter. Thus in a continuous manner a finished web of paper having hardened surfaces obviates the various handlings of the prior art processes and thereby makes it possible to efficiently produce hardened paper at low cost.

Various novel features and advantages of the invention will be more fully referred to in connection with the accompanying drawing, wherein:

Fig. 1 is an 'elevational diagrammatic view of am apparatus for carrying out the novel process per making material from a box or other delivery means 4 at one end thereof. Such paper making material in the form of fibrous material and water is deposited on the Fourdrinier wire so as to form a web of paper W.

From the Fourdrinier wire 2 the more or less wet web W passes on to a felt 6 of a press roll device 5 having press rolls 8. As the web passes through the press rolls 8 it is acted upon in such a way as to be freed of considerable of its moisture content and from this press device 5 the web W passes upwardly through another press apparatus 7 wherein it passes through press rolls 10 to eliminate further moisture.

From the press device 7 the web passes through a drying apparatus 11 which in the preferred form of the invention includes a plurality-of drying cylinders 12 and felts 13. In the drying apparatus 11 the web is dried to such a degree that it may be sized and to accomplish this it is passed through a size apparatus indicated at 14.

The size apparatus 14. may include a suitable tank 15 and rolls 16 and 18. The; tank contains 56 sizing material and the web passes beneath the roll 16 and between rolls 18. The latter rolls are arranged to squeeze the web so as to eliminate excess size taken up by the web.

The size may be made from any suitable size material such as starch, bone or hide cuttings, pe- {1W3 troleum, vegetable wax or the like or suitable combinations of these materials. The sizing apparatus is preferably so arranged that the web is subjected to substantially complete saturation by the sizing bath as the web passes therethrough.

From the size bath the web passes through or past a hardening unit 19 so that it is subjected to the action of a hardening medium. This apparatus,'in the preferred form of the invention, consists in part of a transverse pipe 20 having upwardly extending nozzles 22 and an air pipe 24 is in substantial parallelism with the pipe 20 which has air directing nozzles 26 extending therefrom. The nozzles 26 are preferably disposed so as to direct jets of air across the outlets of the upwardly extending nozzles 22 and thereby lift hardening material from the nozzles 20 and blow it on to a baffle-plate 28 which extends in an angular relation with. respect to the web W.

As the hardening material is blown on to the plate 28 it is deflected thereby upwardly on to the web W so as to cover the same more or less uniformly or is applied to the web as a coating.

The hardening material may consist of formaldehyde or any suitable substance and if desired the apparatus may be arranged to apply the hardening material to either one or both sides of the web.

In lieu of the spraying apparatus shown for applying the hardening bath to the web, it may be desirable to employ a tank with rolls similar to those of the size tank, so that the web will pass through the bath for application of the hardening substance.

According to the novel features of the invention the web is formed and moved through the apparatus in a continuous manner. This is so that not only will the hardening bath be applied to the web in the proper manner, but according to a special feature of the invention the hardening 100 material is applied to the surface or surfaces of the web only as distinguished from complete penetration of the web as in the prior art.

From the hardening bath the web immediately passes through a plurality of drying cylinders or 105 rolls 32 whereby the web is finally dried and from these drying cylinders the web is passed through the rolls of a calender stack 35 for finishing effects after which it is reeled up in roll form as indicated by 36. The hardening material is dried I10 plete penetration of the web. Thisi immediately so that it will not penetrate the web and become discolored.

Rolls such as 38 are provided for supporting and guiding the web between the different units of the apparatus.

From the foregoing it will be observed that the paper web is formed, subjected to a drying action, sized and then treated with a hardening material, dried, passed through the stack and finally reeled up. This is all accomplished as a continuous operation so that a finished web is provided which has hardened surfaces.

It will be noted that as a special feature of the invention the hardening material is' applied to one or both surfaces as distinguis ed from coms to provide a web which has hardened, waterproofed surfaces, but yet one which is readily bendable and pliable. This is to be distinguished from the prior art processes where complete penetration of the web produces material which is stiff and non-pliable.

Also as distinguished from the prior art processes, it will be noted that the web is formed and treated in a continuous manner so as to obviate the separate hardening and seasoning steps. In the prior art processes where the wet paper is rolled up, it tends to discolor and the hardening effect is non-uniform. In connection with this improved process, however, the web is treated for the hardening effect and immediately dried so that it is wound up in a dry, finished condition. The most uniform hardening effect is thereby obtained without injuriously affecting the color or other surface characteristics of the paper and the to be limited by the foregoing description, but if r at all, by the appended claims.

What I claim is:

1. In paper making apparatus, means for supporting acontinuously moving web of paper, a

deflector member arranged at a side of a web on said supports, apipe adjacent said deflector having nozzles for emitting hardening material, a second set of nozzles arranged adjacent said first named nozzle for directing fluid onto said first named nozzles to blow. said material therefrom onto said deflector member.

2. In paper making apparatus, means for supporting a continuously moving webv of paper, a deflector plate disposed to have a surface in an angular relation relative to a web supported by said supporting means, a pipe in front of said plate having upwardly extending nozzles, a second pipe having nozzles directed towards said first-named nozzles for directing fluid nozzles to ,blow material from said first-named nozzle onto said plate.

3. In paper making apparatus means for supporting a continuously moving web of paper, means for drying and sizing said web of paper, means for spraying a coating of hardening material upon the exterior surface of said web in order to prevent the hardening of the interior fibers of said web and means for drying said hardening material immediately after the coating thereof upon said web.

4. A process for producing paper having a hardened waterproofed surface that includes the steps of coating the surface only of the paper with hardening material and then drying the same immediately.

5. A process for producing paper having a hardened waterproofed surface that includes the steps of spraying the surface only of the paper with hardening material and then drying the same immediately.

6. A continuous process for producing paper having a hardened surface which comprises, subjecting the surface only of a sized web of dried paper to the application of hardening material and then in immediately drying said web to bring about hardening of the surface thereof and preventing hardening of the interior fibers of the web.

LEON M. YOERG. 

